Question

I’m new to the prototype structure, and I’m having trouble figuring this one out. Here’s my JavaScript code.

var Game = function ()
{
   //some variables
};
Game.prototype.block = 
{
    spawn: function () {
        var t1 = new this.inst;
    },
    inst : {
        x: 5,
        y: 0,
        type: ''
    }
};

When I try to create a new object “inst” I get the following error:
TypeError: object is not a function. What am I doing incorrectly?

Answer 1

If you want to create objects that inherit from the inst object, you can do that using Object.create, with var t1 = Object.create(this.inst);.

var Game = function () {
   //some variables
};
Game.prototype.block =  {
    spawn: function () {
        var t1 = Object.create(this.inst);
    },
    inst : {
        x: 5,
        y: 0,
        type: ''
    }
};

So then your code would look something like this;

var game = new Game();

game.block.spawn();

And the .spawn() method would have a variable that references an object that inherits from the Game.prototype.block.inst object.